<form action="<?php echo url_for('index/login') ?>" id="formLogin" method="post">
  <?php echo $form->renderHiddenFields() ?>
  <?php echo $form->renderGlobalErrors() ?>

  <?php echo $form['email']->render(array('class' => 'signup_input')) ?>
  /
  <?php echo $form['password']->render(array('class' => 'signup_input')) ?>
  Remember? <?php echo $form['remember']->render(array('class' => 'signup_input')) ?>
  <br /><br />
  <input type="submit" value="Login" />

  <?php echo $form['email']->renderError() ?>
  <?php echo $form['password']->renderError() ?>
</form>